klipper/autotests: Add SPDX header

GIT_SILENT

klipper/autotests/utilstest.cpp

+/*
+    SPDX-FileCopyrightText: 2022 Popov Eugene <popov895@ukr.net>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
 #include "../utils.h"
 
 #include <QObject>